rwmidi - SysEx message not being sent

I am using rwmidi in Processing 3.3.5 on a Mac 10.13.3. I can send a note on message and see it on the MIDI monitor and it returns a 1. However, when sending the SysEx message, while it still returns a 1, no message shows up in the MIDI monitor nor the device I am trying to communicate with ( An Arduino Micro ), this is the function I send on a mouse press:-